@Keruskerfuerst and @vincix, thank you very much. Like you advised I rechecked and figured it where I was doing wrong.
In previous versions of CentOS, I had, in its simple partition configuration,
/boot/efi standard partition and
/ LVM volume. The
/boot/efi would sit on
/boot directory with is in LVM
/ volume. Even though anaconda complained, clicking 'Done' two times would continue installation.
In CentOS 7.3-1661 though, its adamant and refused to continue till the /boot partition is made of standard type and not an LVM one. So I created three partitions -
- /boot -> 1GiB - xfs standard partition
- /boot/efi -> 500Mib -> efi standard partition
- /dev/vg/root -> 10GiB -> xfs LVM volume
Now installation was smooth as cream.
Thank you very much.